• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced energy materials >Effect of Polymer-Fullerene Interaction on the Dielectric Properties of the Blend
【24h】

Effect of Polymer-Fullerene Interaction on the Dielectric Properties of the Blend

机译：聚合物-富勒烯相互作用对共混物介电性能的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

It is commonly believed that large dielectric constants are required for efficient charge separation in polymer photovoltaic devices. However, many polymers used in high-performance solar cells do not possess high dielectric constants. In this work, the effect of polymer-fullerene interactions on the dielectric environment of the active layer blend and the device performance for several donor-acceptor conjugated polymer systems is investigated. It is found that, while none of the high-performing polymers studied has a dielectric constant value larger than 3, all polymer-fullerene blends have a significantly larger dielectric constant compared to their pristine constituents. Additionally, it is found that the blend dielectric constant reaches a maximum value in fully optimized devices. Using PTB7:PC71BM blends as an example, it is showed that, in addition to a small increase in the dielectric constant, devices fabricated using the optimum processing additive concentration exhibit almost 3X larger excited state polarizability. This large increase in excited state polarizability results in a substantial difference in short-circuit current and ultimately device performance. The results show that the excited state polarizability critically depends on polymer-fullerene interactions, and can be a leading indicator of device performance for a given material system.
机译：通常认为，对于聚合物光伏器件中的有效电荷分离，需要大的介电常数。然而，许多用于高性能太阳能电池的聚合物不具有高介电常数。在这项工作中，研究了聚合物-富勒烯相互作用对活性层共混物介电环境的影响以及几种供体-受体共轭聚合物体系的器件性能。已发现，虽然所研究的高性能聚合物均没有介电常数值大于3的，但与原始成分相比，所有聚合物-富勒烯共混物的介电常数都明显更大。另外，发现在完全优化的器件中混合介电常数达到最大值。以PTB7：PC71BM共混物为例，结果表明，除了介电常数略有增加外，使用最佳加工添加剂浓度制造的器件还表现出几乎三倍的激发态极化率。激发态极化率的大幅提高导致短路电流和最终器件性能的显着差异。结果表明，激发态的极化率主要取决于聚合物-富勒烯的相互作用，并且可以作为给定材料系统的器件性能的领先指标。

著录项

  • 来源
    《Advanced energy materials》 |2017年第13期|1601947.1-1601947.7|共7页
  • 作者

    Constantinou Iordania; Yi Xueping; Shewmon Nathan T.; Klump Erik D.; Peng Cheng; Garakyaraghi Sofia; Lo Chi Kin; Reynolds John R.; Castellano Felix N.; So Franky;

  • 作者单位

    North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27606 USA;

    North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27606 USA;

    North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27606 USA;

    Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA;

    Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA;

    North Carolina State Univ, Dept Chem, Raleigh, NC 27606 USA;

    Georgia Inst Technol, Sch Chem & Biochem, Sch Mat Sci & Engn, Ctr Organ Photon & Elect,Georgia Tech Polymer Net, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Sch Chem & Biochem, Sch Mat Sci & Engn, Ctr Organ Photon & Elect,Georgia Tech Polymer Net, Atlanta, GA 30332 USA;

    North Carolina State Univ, Dept Chem, Raleigh, NC 27606 USA;

    North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27606 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号